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lp22
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Posts: 6
Registered: ‎03-14-2019
Location: IT
Views: 173
Message 1 of 2

X1 Carbon 6th Gen Ubuntu 18.04: very slow SSD

Hi all.

 

The SSD of my X1C6 is surprisingly slow. Sequentially reading the first gigabyte of the device, right after boot, I get:

# dd if=/dev/nvme0n1 bs=1M count=1024 of=/dev/null
1024+0 records in
1024+0 records out
1073741824 bytes (1.1 GB, 1.0 GiB) copied, 23.3171 s, 46.0 MB/s

46 MB/s. I'm so sad.

 

I also think it is getting worse as the days passes.

 

Fstrim is running once a week, as by Ubuntu's default. I ran fstrim manually (and then rebooted after that), before the command above.

Apart this slowness, everything works fine.

 

Any ideas about what's going on? Suggestions?

 

Thanks.

lp22
Fanfold Paper
Posts: 6
Registered: ‎03-14-2019
Location: IT
Views: 144
Message 2 of 2

Re: X1 Carbon 6th Gen Ubuntu 18.04: very slow SSD

I'd like to leave a note, maybe it could be useful to some other users.

 

I dug a little bit into my problem and I'm pretty sure it is related to the LVM installation I'm running. I still don't know if LVM doesn't pass the trim commands to the underlying physical device or something else, but I can say that this isn't a Thinkpad specific issue.

 

 

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